HDA

• Intel High Definition Audio
• OPC Historical Data Access
• {{mono|/dev/hda}}, see Device file § Naming conventions
• Head and Disk Assembly of a Winchester disk

• Helicase-dependent amplification
• High density amorphous ice
• Higher-dimensional algebra

• Dragonair
• Ein Shemer Airfield
• Hardlines Distribution Alliance, a hardware store retailers' cooperative
• Hockey Diversity Alliance
• The Holy Demon Army
• Huntington's Disease Association
• HiTeC Digital Audio, former name of Auzentech

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